As somebody said, either a brick or brass knuckles. This was more than just a “punch.”
I’m betting radical leftist. They hate Berlusconi, and Milan is one of their big hang-outs. Also, they’ve been very violent lately, even against more moderate leftists (the incidents in Berkeley where they were attacking the university president’s house, for example).
Fox News reported it was a statue of a cathedral that was used to hit him. ????
Milan is a big hangout of what? Have you even ever been in Milan at all?
Silvio Berlusconi, for the record, was not punched: this crazy guy threw a miniature Duomo at him.